Writing instrument



FIG. 1 is a front left perspective view of our new design for a writing instrument;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof.

FIG. 8 is a front left perspective view of a second embodiment of FIG. 1 with the banner pulled out;

FIG. 9 is a left side view thereof;

FIG. 10 is a right side view thereof;

FIG. 11 is a front view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a top view thereof; and,

FIG. 14 is a bottom view thereof.

The features shown in broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a writing instrument, as shown and described. 